Activity26 Soln - SOLUTION In-Class Activity#26 unchecked...

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ECSE-2660 Computer Architecture, Networks, & Operating Systems, Spring 2001 Page 1 of 2 SOLUTION In-Class Activity #26 unchecked 4/25/2001 9:53 AM Activity 26.1 Network Addresses. 1. (18 points) Assuming that network ID’s with all bits being 0, or all bits being 1 are not allowed, fill up the following table. Class Maximum number of network ID’s that can be assigned Example of an organization hosting a network of this class. Class A 2 7 - 2 =126 MIT Class B 2 14 - 2 = 16382 RPI Class C 2 21 - 2 = 2097150 Yahoo Grading: 4 pts for each row in left column, 2 in right column, 1 each for trying. 2. (32 Points) A host has an IP address of 128.113.50.30 and a subnet mask of 255.255.255.0. Answer (a) through (d). (a) What network class does this IP address belong to? Answer: Since it starts with 128, it must be a Class B network. (b) What is the network ID of this host? Answer: Since it is a class B network, the first 16 bits represent net_id. So the netid is 128.113 (c) What is the subnet ID of this host? (The subnet ID includes the network ID as well).
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